Ms. Catherine Barrat Profile

Catherine Barrat

at HGH Systèmes Infrarouges

SPIE Involvement:

Author

Proceedings Article | 23 October 2023 Presentation + Paper

Design of a unique optical bench for complete performance characterization of night vision device

Morgane Lardennois, Romane Dorino, Adrien Bertaud, Marie d'Autume, Guillaume Arquetoux, Arnaud Louboutin, Catherine Barrat, Romain Guider

Proceedings Volume 12737, 127370F (2023) https://doi.org/10.1117/12.2680498

KEYWORDS: Night vision goggles, Cameras, Optical benches, Goggles, Collimators, Design and modelling, Optical testing, Light sources, Night vision systems, Image intensifiers

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Proceedings Article | 20 September 2020 Presentation + Paper

Improved modulation transfer function evaluation method of a camera at any field point with a scanning tilted knife edge

Etienne Homassel, Catherine Barrat, Frédéric Alves, Gilles Aubry, Guillaume Arquetoux

Proceedings Volume 11537, 115370B (2020) https://doi.org/10.1117/12.2572852

KEYWORDS: Modulation transfer functions, Cameras, Optics manufacturing, Modulation, Design for manufacturability, Algorithm development, Collimators, Device simulation, Diagnostics, Prototyping

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Modulating Transfer Function (MTF) has always been very important and useful for objectives quality definition and focal plane settings. This measurand provides the most relevant information on the optimized design and manufacturing of an optical system or the correct focus of a camera. MTF also gives out essential information on which defaults or aberrations appear on an optical objective, and so enables to diagnose potential design or manufacturing issues on a production line or R&D prototype. Test benches and algorithms have been defined and developed in order to satisfy the growing needs in optical objectives qualification as the latter become more and more critical in their accuracy and quality specification. Many methods are used to evaluate the Modulating Transfer Function. Slit imaging and scanning on a camera, MTF evaluation thanks to wavefront measurement or imaging fixed slanted knife edge on the detector of the camera. All these methods have pros and cons, some lack in resolution, accuracy or don’t enable to compare simulated MTF curves with real measured data. These methods are firstly reminded in this paper. HGH has recently developed an improved and mixed version of a scanning technique used on a slanted knife edge giving a more accurate, ergonomic, high resolution and precise Line Spread Function (LSF) and one axis MTF measurement of a camera. A selected single pixel corresponding to a precise field point of the camera is scanned with sub pixelic resolution by the tilted knife edge thus enabling an optimized accuracy for LSF and MTF curves. The experimental protocol which requires a high-performance collimator, a scanning wheel device and a camera set up is detailed in this paper. Explained simulations are done to prove the under 1% accuracy of this method with regards to the different characteristics of the camera. All the parameters of this improved measurement technique are described and their effect criticized to give out all the result influence of these variables. These simulations and the algorithms used are then confronted to real measurements on a camera thanks to a mirror-based collimator and a scanning wheel device equipped with a slanted knife edge target.

Proceedings Article | 20 June 2019 Presentation + Paper

Advancing the performance of extended area blackbody sources in order to stay ahead of the IR camera improvements

Stephen Scopatz, Catherine Barrat

Proceedings Volume 11001, 110010V (2019) https://doi.org/10.1117/12.2519146

KEYWORDS: Infrared cameras, Cameras, Black bodies, Sensors, Infrared sensors, Temperature metrology, Nonuniformity corrections, Infrared imaging, Staring arrays, Electro optics

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Proceedings Article | 9 October 2018 Presentation + Paper

Influence of ambient temperature on the radiation of IR reference sources: effect on the calibration of IR sensors and method of compensation

Catherine Barrat, Alex Audouin, Gauthier Auvray

Proceedings Volume 10795, 107950M (2018) https://doi.org/10.1117/12.2325369

KEYWORDS: Temperature metrology, Black bodies, Calibration, Sensors, Infrared sensors, Infrared radiation, Sensor calibration

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Proceedings Article | 6 October 2017 Presentation + Paper

Extension to NIR and visible ranges of high-resolution relative spectral response measurement using Fourier Transform Infrared Spectrometer (FTIR) of CMOS FPAs

Catherine Barrat, Thierry Lepot, Michael Ramamonjisoa, Sébastien Fradcourt

Proceedings Volume 10433, 1043316 (2017) https://doi.org/10.1117/12.2278301

KEYWORDS: FT-IR spectroscopy, Sensors, Spectral resolution, Near infrared, Visible radiation, Spectroscopy, Staring arrays, Fourier transforms, Signal detection, Helium neon lasers

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Proceedings Article | 21 October 2016 Presentation + Paper

A practical implementation of high resolution relative spectral response measurement of CMOS IRFPAs using Fourier Transform Infrared Spectrometer (FTIR)

Catherine Barrat, Thierry Lepot, Michael Ramamonjisoa, Sébastien Fradcourt

Proceedings Volume 9987, 99870V (2016) https://doi.org/10.1117/12.2242014

KEYWORDS: Sensors, Spectral resolution, FT-IR spectroscopy, Infrared spectroscopy, Signal detection, Black bodies, Spectroscopy, Infrared sensors, Mirrors, Monochromators

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Proceedings Article | 13 October 2015 Paper

Evaluating uniformity of IR reference sources

Catherine Barrat, Sébastien Violleau

Proceedings Volume 9649, 964907 (2015) https://doi.org/10.1117/12.2194770

KEYWORDS: Black bodies, Thermography, Radiometry, Temperature metrology, Sensors, Infrared sensors, Cameras, Infrared radiation, Calibration, Infrared cameras

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Proceedings Article | 7 October 2014 Paper

Evaluating performances of vacuum dedicated blackbodies

Catherine Barrat, Vincent Leboucher

Proceedings Volume 9241, 924117 (2014) https://doi.org/10.1117/12.2067161

KEYWORDS: Black bodies, Infrared sensors, Calibration, Sensors, Infrared radiation, Reflection, Satellites, Temperature metrology, Ray tracing, Thermography

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Proceedings Article | 25 October 2013 Paper

Improving cooling of cavity blackbodies

Catherine Barrat, Gildas Chauvel

Proceedings Volume 8896, 88960L (2013) https://doi.org/10.1117/12.2028874

KEYWORDS: Black bodies, Convection, Infrared sensors, Infrared radiation, Temperature metrology, Calibration, Manufacturing, Infrared imaging, Coating, Infrared technology

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Showing 5 of 9 publications

Conference Committee Involvement (1)

SPIE Security + Defence

9 September 2019 | Strasbourg, France

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